drain

Abstract

To provide a drain that can improve drainage capacity. [Solution] The drain comprises a first cylindrical portion positioned at the inlet of the gutter, a first flange extending outward from the upstream end of the first cylindrical portion and positioned at the periphery of the inlet in the gutter, and a first member having one or more locking pieces projecting from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion, a second cylindrical portion defining the upstream end into which the downstream end of the first cylindrical portion is inserted, and a second member having one or more locking holes positioned in the second cylindrical portion such that one or more locking pieces fit when the first cylindrical portion is inserted to a defined position relative to the second cylindrical portion, the inner diameter of the inlet is 30 mm or more and 70 mm or less, and if the inner diameter of the first cylindrical portion is Du and the inner diameter of the second cylindrical portion is D, then the condition 0.90D ≤ Du ≤ 0.95D is satisfied.

Description

[Technical Field]

[0001] The present disclosure relates to a drain. [Background Art]

[0002] Patent Document 1 discloses a drainage member. The drainage member disclosed in Patent Document 1 comprises a cylinder, a flange extending radially outward from the cylinder, and a plurality of ribs extending upward from the flange and arranged in a circumferential direction of the cylinder, wherein a distance between radially inner ends of two circumferentially adjacent ribs is 25 mm or more; a first space is formed above an upper surface of the flange and below an upper edge of the rib, the first space is a space penetrating through the drainage member along a first direction which is one of directions orthogonal to a central axis of the cylinder, and a height of the first space is 20 mm or more and not more than a height of the rib. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2023-152746 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Patent Document 1 describes that the drainage member is fixed by screwing a threaded portion of a cylindrical part. In consideration of drainage capacity, it is preferable to make an inner diameter of the drainage member as large as possible relative to an outer diameter of the drainage member. However, in Patent Document 1, since it is necessary to ensure the wall thickness of the threaded portion, the size of the inner diameter relative to the outer diameter of the drainage member is restricted accordingly, so that a desired drainage capacity may not be obtained in some cases.

[0005] The present disclosure provides a drain capable of improving drainage capacity. [Means for Solving the Problem]

[0006] A drain according to one aspect of the present disclosure comprises a first cylindrical portion disposed at the inlet of a gutter, a first flange extending outward from the upstream end of the first cylindrical portion and disposed at the periphery of the inlet in the gutter, and a first member having one or more locking pieces projecting from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion, a second cylindrical portion defining the upstream end into which the downstream end of the first cylindrical portion is inserted, and a second member having one or more locking holes located in the second cylindrical portion such that one or more locking pieces fit when the first cylindrical portion is inserted to a defined position relative to the second cylindrical portion, wherein the inner diameter of the inlet is 30 mm or more and 70 mm or less, and if the inner diameter of the first cylindrical portion is Du and the inner diameter of the second cylindrical portion is D, then the condition 0.90D ≤ Du ≤ 0.95D is satisfied. [Effects of the Invention]

[0007] The aspects of this disclosure can improve drainage capacity. [Brief explanation of the drawing]

[0008] [Figure 1] Schematic diagram of a gutter drainage structure including a drain according to one embodiment. [Figure 2] Cross-sectional view of the gutter drainage structure including the drain according to the above embodiment. [Figure 3] Perspective view of the drain according to the above embodiment [Figure 4] Exploded perspective view of the drain according to the above embodiment. [Figure 5] Cross-sectional view of the first drain member according to the above embodiment. [Figure 6] Side view of the first drain member according to the above embodiment [Figure 7] Perspective view of the first drain member according to the above embodiment [Figure 8] Plan view of the first drain member according to the above embodiment [Figure 9] Bottom view of the first drain member according to the above embodiment. [Figure 10] Cross-sectional view of the second drain member according to the above embodiment. [Figure 11] Perspective view of the second drain member according to the above embodiment. [Figure 12] Top plan view of the second member of the drain according to the above embodiment [Figure 13] Side elevational view when the first member and the second member of the drain according to the above embodiment are fitted together [Figure 14] Cross-sectional view of the third member of the drain according to the above embodiment [Figure 15] Schematic diagram of an eaves gutter drainage structure including a drain according to a modified example [Figure 16] Perspective view of the second member of the drain according to a modified example [Figure 17] Cross-sectional view of the second member of the drain according to a modified example [Figure 18] Top plan view of the second member of the drain according to a modified example DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, an unnecessarily detailed description may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding for those skilled in the art. The inventor(s) provide the accompanying drawings and the following description for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims thereby.

[0010] Unless otherwise specified, positional relationships such as up, down, left and right are based on the positional relationships shown in the drawings. Each figure described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each constituent element in each figure does not necessarily reflect the actual dimensional ratio. In addition, the dimensional ratio of each element is not limited to the ratio shown in the drawings.

[0011] Note that, in the following description, when it is necessary to distinguish between a plurality of constituent elements from each other, prefixes such as "first" and "second" are added to the names of the constituent elements; however, when the constituent elements can be distinguished from each other by the reference numerals assigned thereto, the prefixes such as "first" and "second" may be omitted in consideration of readability of the description.

[0012] [1. Embodiment] [1.1. Configuration] FIG. 1 is a schematic diagram of an eaves gutter drainage structure 100 including a drain 1 according to the present embodiment.

[0013] The eaves gutter drainage structure 100 is a piping system for conveying a fluid having a Reynolds number of 4000 or more. It can be said that a fluid having a Reynolds number of 4000 or more is a fluid in which the flow in a cylinder becomes turbulent. Examples of the fluid include liquids (drinking water, heat source water, drainage, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flows (mixtures of liquid and gas). The eaves gutter drainage structure 100 constitutes a rain gutter system that receives rainwater from a roof 210 of a building 200 and allows the rainwater to flow to a basin part 310 on the ground 300. The rainwater collected in the basin part 310 flows out from the basin part 310 through a buried pipe 320 to a rainwater pipe. The building 200 is, for example, a non-residential facility such as a store, an office, a factory, a building, a school, a welfare facility or a hospital, or a residential facility such as a detached house, an apartment house, or each dwelling unit of a detached house or an apartment house. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complex facilities, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground malls, stations, airports, and the like. The roof 210 may be a flat roof or a folded-plate roof. In FIG. 1, the roof 210 is a folded-plate roof.

[0014] The eaves gutter drainage structure 100 includes the drain 1, an eaves gutter 10, and a vertical pipe 11.

[0015] The gutter 10 receives rainwater from the roof 210 of the building 200. The gutter 10 is installed under the roof 210 of the building 200. For example, the gutter 10 is positioned at the eaves of the roof 210. In particular, the gutter 10 is positioned to extend along the eaves of the roof 210. The gutter 10 is a long, barrel-shaped structure. The gutter 10 has a bottom wall 10a. An inlet 10b is formed in the bottom wall 10a. The inlet 10b is, for example, a circular opening. In a rain gutter system, the inlet 10b is also called a water collection opening, drainage opening, or outlet. For example, the gutter 10 may be formed by extrusion molding of a resin material. The gutter 10 may have a core material to reinforce the overall strength of the gutter 10. The core material may be, for example, metal. Alternatively, the gutter 10 may be formed from a metal sheet, for example, a steel sheet (also called a coil).

[0016] Drain 1 is positioned at the inlet 10b of the gutter 10. Drain 1 is used to reduce the generation of vortices and the entrainment of air at the inlet 10b.

[0017] Figure 2 is a cross-sectional view of the gutter drainage structure 100 including the drain 1. The vertical pipe 11 is not shown in Figure 2. Figure 3 is a perspective view of the drain 1. Figure 4 is an exploded perspective view of the drain 1. As shown in Figures 2 to 4, the drain 1 comprises a first member 2, a second member 3, and a third member 4, with the first member 2 connected to the inlet 10b of the gutter 10 from above, and the second member 3 and the third member 4 connected from below.

[0018] Figure 5 is a cross-sectional view of the first member 2. Figure 6 is a side view of the first member 2. Figure 7 is a perspective view of the first member 2. Figure 8 is a top view of the first member 2. Figure 9 is a bottom view of the first member 2. Here, Figures 2 and 5 are cross-sectional views taken along line AA in Figure 8.

[0019] The first member 2 comprises a first cylindrical portion 20, a first flange 21, a locking piece 22, and a handle 23. The material of the first member 2 is, for example, rigid polyvinyl chloride.

[0020] As shown in Figures 5 and 6, the first cylindrical portion 20 has an upstream end 20a and a downstream end 20b. The first cylindrical portion 20 further has a drain opening 20c. The drain opening 20c is the internal space between the upstream end 20a and the downstream end 20b of the first cylindrical portion 20. The first cylindrical portion 20 is cylindrical in shape, with its inner diameter gradually increasing from the downstream end 20b to the upstream end 20a. In this embodiment, in a cross-section passing through the central axis C20 of the first cylindrical portion 20, the inner circumferential surface 20d of the first cylindrical portion 20 is an inclined surface. The central axis C20 of the first cylindrical portion 20 coincides with the central axis C2 of the first member 2.

[0021] The first flange 21 extends radially outward from the upstream end 20a of the first cylindrical portion 20. The first flange 21 is annular. The first flange 21 has a first surface 21a and a second surface 21b. The first surface 21a is the surface of the first flange 21 opposite to the first cylindrical portion 20 (the upper surface in Figure 5). The second surface 21b is the surface of the first flange 21 on the side of the first cylindrical portion 20 (the lower surface in Figure 5). Referring to Figure 5, the inner circumferential surface 20d of the first cylindrical portion 20 and the first surface 21a of the first flange 21 are connected by a curved surface 21c in a cross-section passing through the central axis C20 of the first cylindrical portion 20. The radius of curvature of this curved surface 21c is preferably 1 mm or more. Referring to Figure 2, the first flange 21 is positioned on the peripheral edge 10c of the inlet 10b of the gutter 10 such that the second surface 21b is in contact with the peripheral edge 10c of the inlet 10b of the gutter 10.

[0022] The locking piece 22 is a portion that protrudes from the downstream end 20b of the first cylindrical portion 20 in the direction of the central axis C20 of the first cylindrical portion 20. As shown in Figures 2 and 5, the locking piece 22 has an upstream end 22a and a downstream end 22b. As shown in Figure 9, the locking piece 22 has a circumferential width centered on the central axis C2 of the first member 2 and has the shape of a part of a cylinder (arc-shaped) having the same outer and inner diameters as the outer and inner diameters at the downstream end 22b of the first cylindrical portion 20. The upstream end 22a of the locking piece 22 is connected to the downstream end 20b of the first cylindrical portion 20. In this embodiment, the first member 2 comprises two locking pieces 22. The two locking pieces 22 are arranged symmetrically with respect to the central axis C20 of the first cylindrical portion 20. As can be seen from Figures 5 and 9, the distance Du between the inner wall surfaces of the locking piece 22 passing through the central axis C20 of the first cylindrical portion 20 coincides with the inner diameter at the downstream end 20b of the first cylindrical portion 20. Note that the locking piece 22 may be formed as the whole, not just a part, of a cylinder having the same outer and inner diameters as the downstream end 22b of the first cylindrical portion 20. Note that the distance Du of the locking piece 22 may gradually change from the upstream end 22a to the downstream end 22b.

[0023] In this embodiment, the locking piece 22 has a spring portion 221 and a claw portion 222. The spring portion 221 is a portion that protrudes from the downstream end 20b of the first cylindrical portion 20 in the direction of the central axis C20 of the first cylindrical portion 20. The upstream end of the spring portion 221 is the upstream end 22a of the locking piece 22, and the downstream end of the spring portion 221 is the downstream end 22b of the locking piece 22.

[0024] The claw portion 222 is a portion that protrudes radially outward from the spring portion 221 of the first cylindrical portion 20. In this embodiment, the claw portion 222 has a shape that has a circumferential width w along the outer circumferential surface of the spring portion 221 and centered on the central axis C20 of the first cylindrical portion 20. The claw portion 222 has an upstream end 222a and a downstream end 222b. As shown in Figure 6, the width w of the claw portion 222 is the same as the circumferential width of the locking piece 22. The length d of the claw portion 222 is equal to the distance between the upstream end 222a and the downstream end 222b in the direction of the central axis C20 of the first cylindrical portion 20. The length d of the claw portion 222 is less than or equal to the length of the spring portion 221 (i.e., the distance between the upstream end 22a and the downstream end 22b of the locking piece 22 in the direction of the central axis C20 of the first cylindrical portion 20). The height h of the claw portion 222 gradually decreases from the upstream end 222a to the downstream end 222b, becoming zero at the downstream end 222b.

[0025] The number of claw portions 222 on each locking piece 22 is not particularly limited. Furthermore, the width w, etc., of the claw portions 222 are not limited as long as they are formed to protrude radially outward from the spring portion 221 of the first cylindrical portion 20.

[0026] The handle 23 is used to attach the first member 2. As shown in Figures 6 to 8, in this embodiment, the handle 23 protrudes from the first surface 21a of the first flange 21. The handle 23 has a pair of protrusions 231 and a connecting portion 232. The pair of protrusions 231 protrude from the first surface 21a of the first flange 21. The pair of protrusions 231 are arranged symmetrically with respect to the central axis C20 of the first cylindrical portion 20. Each protrusion 231 is plate-shaped, has width in the radial direction of the first cylindrical portion 20, and thickness in the circumferential direction of the central axis C20 of the first cylindrical portion 20. The corners of the ends opposite to the central axis C20 when viewed from the direction of the central axis C20 of the first cylindrical portion 20 are chamfered or filleted. The thickness of the protrusions 231 decreases as they move away from the first surface 21a of the first flange 21. Thus, each protrusion 231 is shaped so as not to obstruct the flow of rainwater into the drain opening 2c. The connecting part 232 connects the tips of the protrusions 231. The connecting part 232 is plate-shaped.

[0027] Refer to Figure 2 again. The second member 3 is used to connect the first member 2 to the piping member. The piping member may be, for example, a straight pipe, an elbow, or a socket. In this embodiment, the second member 3 is directly connected to the vertical pipe 11, which is a straight pipe.

[0028] Figure 10 is a cross-sectional view of the second member 3. Figure 11 is a perspective view of the second member 3. Figure 12 is a plan view of the second member 3. Here, Figure 10 is a cross-sectional view taken along line BB in Figure 12.

[0029] The second member 3 has a second cylindrical portion 30 that defines the upstream end 3a into which the downstream end 20b of the first cylindrical portion 20 is inserted, and a third cylindrical portion 31 that defines the downstream end 3b of the second member 3 that can be connected to a piping member (vertical pipe 11). The second cylindrical portion 30 and the third cylindrical portion 31 are cylindrical in shape. The central axes C30 and C31 of the second cylindrical portion 30 and the third cylindrical portion 31 coincide with each other and constitute the central axis C3 of the second member 3. The central axis C3 of the second member 3 substantially coincides with the central axis C2 of the first member 2. The second cylindrical portion 30 is located on the upstream side of the second member 3, and the third cylindrical portion 31 is located on the downstream side of the second member 3, and the second cylindrical portion 30 and the third cylindrical portion 31 are formed as a continuous, integral part. The inner diameter of the second cylindrical portion 30 is set to be larger than the outer diameter of the first cylindrical portion 20. In this embodiment, the inner diameter of the second cylindrical portion 30 gradually increases as it approaches the upstream end 3a. This is to facilitate insertion of the downstream end 20b of the first cylindrical portion 20 into the second cylindrical portion 30. Hereinafter, the minimum value of the inner diameter of the second cylindrical portion 30 will be referred to as the inner diameter D of the second cylindrical portion 30. The inner diameter D of the second cylindrical portion 30 defines the inner diameter of the second member 3. In this embodiment, the inner diameter of the third cylindrical portion 31 gradually increases from a value equal to the inner diameter D of the second cylindrical portion 30 as it approaches the downstream end 3b. The outer diameters of the second cylindrical portion 30 and the third cylindrical portion 31 are the same and do not change. The material of the second member 3 is, for example, rigid polyvinyl chloride. The upstream end 3a of the second member 3 is defined by the upstream end 30 of the second cylindrical portion 30 (the upper end in Figure 10), and the downstream end 3b of the second member 3 is defined by the downstream end 31 of the third cylindrical portion 31 (the lower end in Figure 10). As can be seen from Figure 2, the first member 2 and the second member 3 are connected when the downstream end 20b of the first cylindrical portion 20 of the first member 2 is inserted into the upstream end 3a of the second member 3. In the second cylindrical portion 30, a locking hole 32 is positioned where the locking piece 22 fits when the second cylindrical portion 30 is inserted together with the first cylindrical portion 20 to a specified position. The number of locking holes 32 may be greater than or equal to the number of locking pieces 22 that are inserted.

[0030] In this embodiment, as shown in Figure 11, the locking hole 32 is formed to penetrate the peripheral wall of the second cylindrical portion 30. The locking hole 32 is formed along the circumferential direction of the second cylindrical portion 30.

[0031] Referring to Figure 2, the claw portion 222 engages with the locking hole 32 by being inserted radially into the second member 3. The purpose of the locking hole 32 is to engage with the claw portion 222, and it is not necessary for it to penetrate the peripheral wall of the second cylindrical portion 30, as long as it has sufficient depth to allow the claw portion 222 to be inserted radially into the second member 3.

[0032] Figure 13 is a side view of the fitting of the first member 2 and the second member 3. The width w1 of the second cylindrical portion 30 along the circumferential direction in the locking hole 32 is longer than the width w of the claw portion 222. This makes it possible to rotate the second member 3 around its central axis C3 relative to the first member 2. Therefore, by rotating the first member 2 around its central axis C2 relative to the second member 3, the second member 3 can be removed from the first member 2. Furthermore, the corners 32a on the first cylindrical portion 20 side (upstream end 3a side) of both ends of the locking hole 32 in the circumferential direction of the second cylindrical portion 30 are tapered by 1 degree or more. This guides the claw portion 222 to exit the locking hole 32 when the second member 3 is rotated around its central axis C3 relative to the first member 2. Therefore, by rotating the first member 2 around its central axis C2 relative to the second member 3, the second member 3 can be removed from the first member 2. In other words, the rotation of the first member 2 releases the engagement between the claw portion 222 and the locking hole 32, making it easy and quick to connect the drain 1.

[0033] The second member 3 further has a stepped portion 33 that extends radially along the outer circumferential surface of the second member 3. In this embodiment, the stepped portion 33 is formed around the entire circumference of the outer circumferential surface of the second member 3, but it may also be formed on a part of the circumferential direction centered on the central axis C3 of the second member 3.

[0034] The third member 4 covers the gap between the first member 2 and the second member 3, and sandwiches the peripheral edge 10c of the inlet 10b of the gutter 10 between the first member 2 and the second member 3. Figure 14 is a cross-sectional view of the third member 4. Here, Figure 14 has the same cross-section as the cross-section in Figure 2. Referring to Figures 4 and 14, the third member 4 comprises a fourth cylindrical portion 40 and a second flange 41. In this embodiment, the fourth cylindrical portion 40 and the second flange 41 are formed as a continuous, integral unit. The central axis C41 of the second flange 41 and the central axis C40 of the fourth cylindrical portion 40 coincide with each other and constitute the central axis C4 of the third member 4. The material of the third member 4 is, for example, rigid polyvinyl chloride.

[0035] The fourth cylindrical portion 40 is cylindrical in shape, and its inner and outer diameters are larger than those of the second cylindrical portion 30. As can be seen from Figure 2, the fourth cylindrical portion 40 is positioned to surround the second cylindrical portion 30 of the second member 3. Referring to Figure 4, the central axis C4 of the third member 4 coincides with the central axis C2 of the first member 2. The third member 4 has an upstream end 4a and a downstream end 4b. The fourth cylindrical portion 40 has an upstream end 40a and a downstream end 40b.

[0036] The second flange 41 is positioned to extend radially outward from the upstream end 40a of the fourth cylindrical section 40. The second flange 41 has a first portion 411 and a second portion 412. The first portion 411 is an annular shape extending radially outward from the upstream end 40a of the fourth cylindrical section 40. The second portion 412 is cylindrical in shape, projecting from the outer circumference of the first portion 411 toward the opposite side from the fourth cylindrical section 40. The inner and outer diameters of the second portion 412 are larger than the inner and outer diameters of the fourth cylindrical section 40. That is, the pipe diameter of the second flange 41 is larger than the pipe diameter of the fourth cylindrical section 40. The tip of the second portion 412 of the second flange 41 is the upstream end of the second flange 41.

[0037] The upstream end 4a of the third member 4 is the tip of the second portion 412 of the second flange 41, and the downstream end 4b of the third member 4 corresponds to the downstream end 40b of the fourth cylindrical portion 40. The upstream end of the second flange 41 is in contact with the peripheral edge 10c of the inlet 10b of the gutter 10, and the downstream end 40b of the fourth cylindrical portion 40 may be in contact with the stepped portion 33 of the second member 3.

[0038] In the gutter drainage structure 100, as shown in Figure 2, the first member 2 is fitted with the second member 3 and fixed to the gutter 10, and the second cylindrical portion 30 of the second member 3 is surrounded by the fourth cylindrical portion 40 of the third member 4. Furthermore, as a result of the above explanation, the peripheral edge 10c of the inlet 10b of the gutter 10 and the third member 4 are fixed by being sandwiched between the first flange 21 and the stepped portion 33. In addition, the drain 1 is further fixed by sandwiching the peripheral edge 10c of the inlet 10b of the gutter 10 between the second flange 41 and the first flange 21. As a result, the connection portion (fitting portion) between the first member 2 and the second member 3 is covered by the third member 4. Therefore, watertightness of the entire drain 1 can be ensured, and for example, rainwater flowing into the inlet 10b can be prevented from flowing out from the locking hole 32 of the second member 3 at the connection portion between the first member 2 and the second member 3. Furthermore, the outer diameter of the first flange 21 and the inner diameter of the second flange 41 can be arbitrarily determined so as to be able to sandwich the peripheral edge 10c. In addition, with the installation of the third member 4, the fitting point between the first member 2 and the second member 3 is located inside the third member 4, making it less noticeable when viewed as a whole drain 1. This is expected to improve the overall aesthetic appearance of the drain 1.

[0039] Referring to Figures 11 and 12, the second member 3 may have protrusions 34 on its outer circumferential surface. In this embodiment, the protrusions 34 are circular in plan view and four are formed on each of the second cylindrical portion 30 and the third cylindrical portion 31. In this embodiment, the protrusions 34 on the second cylindrical portion 30 contact the inner circumferential surface of the third member 4. The protrusions 34 have the effect of making it difficult for piping members (for example, the third member 4 and the vertical pipe 11) that are in contact with or connected to the outer circumferential surface of the second member 3 to come off due to frictional force. Note that the shape and number of protrusions 34 are not limited to these. This further ensures watertightness throughout the entire drain 1 and improves drainage capacity.

[0040] The vertical pipe 11 defines the vertical flow path. The vertical pipe 11 is fixed to the wall 220 of the building 200. In a rain gutter system, the vertical pipe 11 is also called a downpipe. The vertical pipe 11 is installed to drain rainwater from the inlet 10b. The vertical pipe 11 allows rainwater from the inlet 10b to flow vertically. The vertical pipe 11 is straight. The cross-section perpendicular to the central axis of the vertical pipe 11 is circular. The vertical pipe 11 is positioned so that the direction of its central axis coincides with the vertical direction. The vertical pipe 11 has an upstream end 11a and a downstream end 11b. The upstream end 11a is the end of the vertical pipe 11 that is connected to the inlet 10b (the upper end in Figure 1). The downstream end 11b is the end of the vertical pipe 11 that is inserted into the manhole 310 (the lower end in Figure 1). In Figure 1, a pipe cover 11c is positioned to prevent rainwater from flowing into the manhole 310 through the gap between the vertical pipe 11 and the manhole 310. The length of the vertical pipe 11 is preferably 3m or more. As an example, the material of the vertical pipe 11 is rigid polyvinyl chloride.

[0041] Next, we will further explain the size and other details of each component in Drain 1.

[0042] The inner diameters of the fourth cylindrical section 40 and the vertical pipe 11 are approximately the same. The dimensions of the fourth cylindrical section 40 and the vertical pipe 11, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid polyvinyl chloride pipes".

[0043] Table 1 is an example of nominal diameters of VP rigid polyvinyl chloride pipes according to the standard for rigid polyvinyl chloride pipes (general) specified in JIS K 6741 "Rigid Polyvinyl Chloride Pipes". In Table 1, the units of outer diameter (reference dimension), thickness (minimum dimension) and approximate inner diameter are mm.

[0044]

Table 1

[0045] Table 2 is an example of nominal diameters of VU rigid polyvinyl chloride pipes according to the standard for rigid polyvinyl chloride pipes (general) specified in JIS K 6741 "Rigid Polyvinyl Chloride Pipes". In Table 2, the units of outer diameter (reference dimension), thickness (minimum dimension) and approximate inner diameter are mm.

[0046]

Table 2

[0047] The inner diameters of the fourth cylindrical portion 40 and the vertical pipe 11 may be set based on the approximate inner diameter corresponding to the nominal diameter of the pipe. In addition, the outer diameter of the second member 3 is set to substantially match the inner diameters of the fourth cylindrical portion 40 and the vertical pipe 11, and accordingly, the inner diameter of the second member 3, that is, the inner diameter D of the second cylindrical portion 30 may be set. In the present embodiment, these pipe diameters may be set such that the inner diameter D of the second cylindrical portion 30 satisfies 30 mm < D < 70 mm.

[0048] Referring to Fig. 2, regarding the inner diameter Du of the first cylindrical portion 20, it is preferable that 0.9D ≦ Du ≦ 0.95D is satisfied in relation to the inner diameter D of the second cylindrical portion 30. This widens the fluid flow path, allows the advantage of claw fitting to be fully utilized, and improves drainage capacity.

[0049] Regarding the claw portion 222, the maximum value of the height h extending in the radial direction of the first member 2 is preferably 1 mm or more. This ensures a sufficient fitting force and makes it difficult for the locking piece 22 and the locking hole 32 to disengage.

[0050] It is preferable that the wall thickness (difference between the inner diameter and outer diameter) of the second member 3 be 1 mm or more, and greater than or equal to the maximum height h of the claw portion 222. This prevents the locking piece 22 from coming off the locking hole 32, and also prevents contact between the tip of the claw portion 222 and the inner circumferential surface of the third member 4. As a result, the flow path can be constructed with a smaller wall thickness compared to installing a drain with screws, and the drainage capacity can be improved by increasing the amount of drainage.

[0051] In the circumferential direction of the second cylindrical portion 30, the central angle of the locking hole 32, as viewed from the direction of the central axis C30 of the second cylindrical portion 30, is preferably 10° or more and 90° or less. By making it sufficiently longer than the width w of the claw portion 222 in the circumferential direction, fitting becomes easier and drainage capacity can be improved.

[0052] In the circumferential direction of the second cylindrical portion 30, it is preferable that the corners 32a on the first cylindrical portion side at both ends of the locking hole 32 are tapered by 1 degree or more. This configuration allows for smooth attachment and detachment of the locking piece 22 and the locking hole 32.

[0053] [1.2. Effects, etc.] The drain 1 described above comprises a first member 2 having a first cylindrical portion 20 positioned at the inlet 10b of the gutter 10, a first flange 21 extending outward from the upstream end 20a of the first cylindrical portion 20 and positioned at the peripheral edge 10c of the inlet 10b in the gutter 10, and one or more locking pieces 22 protruding from the downstream end 20b of the first cylindrical portion 20 in the direction of the central axis C20 of the first cylindrical portion 20, and into which the downstream end 20b of the first cylindrical portion 20 is inserted. The inlet 10b comprises a second cylindrical portion 30 defining the upstream end 3a, and a second member 3 having one or more locking holes 32 located in the second cylindrical portion 30 such that one or more locking pieces 22 fit when the first cylindrical portion 20 is inserted to a specified position relative to the second cylindrical portion 30. The inner diameter of the inlet 10b is 30 mm or more and 70 mm or less. If the inner diameter of the first cylindrical portion 20 is Du and the inner diameter of the second cylindrical portion 30 is D, then the condition 0.90D ≤ Du ≤ 0.95D is satisfied. This configuration can improve drainage capacity.

[0054] In the drain 1, the second member 3 has a third cylindrical portion 31 that defines a downstream end 3b that can be connected to a piping member. This configuration can improve drainage capacity.

[0055] In the drain 1, a cylindrical third member 4 is further provided surrounding the second cylindrical portion 30, and the second member 3 has a peripheral edge 10c and a stepped portion 33 that sandwiches the third member 4 between itself and the first flange 21. This configuration can improve drainage capacity.

[0056] In the drain 1, the stepped portion 33 is in contact with the third member 4 around its entire circumference. This configuration can improve drainage capacity.

[0057] In the drain 1, the third member 4 has a fourth cylindrical portion 40 surrounding the second cylindrical portion 30, and a second flange 41 extending outward from the upstream end 40a of the fourth cylindrical portion 40 and sandwiching the peripheral edge 10c between itself and the first flange 21. This configuration can improve drainage capacity.

[0058] In the drain 1, one or more locking pieces 22 include two locking pieces 22 aligned radially to the first cylindrical portion 20 when viewed from the direction of the central axis C20 of the first cylindrical portion 20, and one or more locking holes 32 include two locking holes 32 aligned radially to the second cylindrical portion 30 when viewed from the direction of the central axis C30 of the second cylindrical portion 30. This configuration can improve drainage capacity.

[0059] In the drain 1, one or more locking pieces 22 have a spring portion 221 that protrudes from the downstream end 20b of the first cylindrical portion 20 in the direction of the central axis C20 of the first cylindrical portion 20, and a claw portion 222 that protrudes radially outward from the spring portion 221 of the first cylindrical portion 20, with the height of the claw portion 222 being 1 mm or less. This configuration can improve drainage capacity.

[0060] In the drain 1, in the circumferential direction of the second cylindrical portion 30, one or more locking holes 32 are longer than one or more locking pieces 22, and the central angle of the one or more locking holes 32 as viewed from the direction of the central axis C30 of the second cylindrical portion 30 is 10° or more and 90° or less. This configuration can improve drainage capacity.

[0061] In the drain 1, the corners on the first cylindrical portion 20 side of both ends of the one or more locking holes 32 in the circumferential direction of the second cylindrical portion 30 are tapered by 1 degree or more. This configuration can improve drainage capacity.

[0062] In the drain 1, the locking hole 32 is formed along the inner circumference of the second cylindrical portion 30 in a range of 10° to 90°. This configuration can improve drainage capacity.

[0063] In the drain 1, the inner circumferential surface 20d of the first cylindrical portion 20 and the surface of the first flange 21 opposite to the first cylindrical portion 20 are connected by a curved surface with a radius of curvature of 1 mm or more in the cross-section passing through the central axis C20 of the first cylindrical portion 20. This configuration can improve drainage capacity.

[0064] [2. Variant] The embodiments of this disclosure are not limited to those described above. The embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure can be achieved. Modifications of the embodiments are shown below. The modifications described below can be combined and applied as appropriate.

[0065] Figure 15 is a schematic diagram of a gutter drainage structure 100A including drain 1A in one modified example. Here, descriptions that overlap with the above embodiment are omitted as appropriate.

[0066] The eaves gutter drainage structure 100A comprises a drain 1A, an eaves gutter 10, a vertical pipe 11, a horizontal pipe 12, and a bent pipe 13.

[0067] The horizontal pipe 12 defines a flow path that intersects the vertical direction. In a rain gutter system, the horizontal pipe 12 is also called a connecting pipe or horizontal pipe. In this embodiment, the horizontal pipe 12 is located between the inlet 10b and the vertical pipe 11. The horizontal pipe 12 is straight. The cross-section perpendicular to the central axis of the horizontal pipe 12 is circular. The horizontal pipe 12 has an upstream end 12a and a downstream end 12b. The upstream end 12a is the end of the horizontal pipe 12 that connects to the inlet 10b (the left end in Figure 1). The downstream end 12b is the end of the horizontal pipe 12 that connects to the vertical pipe 11 (the right end in Figure 1). As an example, the material of the horizontal pipe 12 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 12, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipes".

[0068] The bent pipe 13 changes the direction of the flow path. The bent pipe 13 is a connecting joint that connects flow paths with different directions, such as a vertical pipe and a horizontal pipe. The bent pipe 13 has an upstream receiving port 13a, a downstream receiving port 13b, and a bent section 13c. The bent section 13c, the upstream receiving port 13a, and the downstream receiving port 13b are formed as a continuous, integral part. The upstream receiving port 13a is connected to the downstream end 12b of the horizontal pipe 12, and the downstream receiving port 13b is connected to the upstream end 11a of the vertical pipe 11. As an example, the material of the bent pipe 13 is rigid polyvinyl chloride. The dimensions of the bent pipe 13 may be set in accordance with the JIS K 6739 standard "Rigid polyvinyl chloride pipe fittings for drainage".

[0069] Drain 1A is positioned at the inlet 10b of the gutter 10. Drain 1A is used to reduce the generation of vortices and the entrainment of air at the inlet 10b. Drain 1A comprises a first member 2, a second member 3A, and a third member 4.

[0070] Figure 16 is a perspective view of the second member 3A. Figure 17 is a cross-sectional view of the second member 3A. Figure 18 is a plan view of the second member 3A. Here, Figure 17 is a cross-sectional view taken along line CC of Figure 18.

[0071] Unlike the second member 3, the second member 3A changes the direction of the flow path. The second member 3A is a connecting joint that connects flow paths with different directions, such as a vertical pipe and a horizontal pipe. The second member 3A has a second cylindrical section 30, a third cylindrical section 31, and a bent section 35. In this modified example, the central axes C30 and C31 of the second cylindrical section 30 and the third cylindrical section 31 intersect each other. For example, the angle between the central axes C30 and C31 may be 91.17 degrees as specified in the JIS K 6739 standard "Rigid polyvinyl chloride pipe fittings for drainage", or it may be 45 degrees. The bent section 35 and the second cylindrical section 30 and the third cylindrical section 31 are formed as a continuous, integral part.

[0072] The second member 3A further has a stepped portion 33A that extends radially along the outer circumferential surface of the second member 3A. In this modified example, the stepped portion 33A is located between the outer circumferential surface of the bent portion 35 and the outer circumferential surface of the second cylindrical portion 30. The stepped portion 33A is formed around the entire circumference along the outer circumferential surface of the second cylindrical portion 30, but it may also be formed on a part of the outer circumferential surface of the second cylindrical portion 30.

[0073] In the eaves gutter drainage structure 100A, the first member 2 is fitted with the second member 3A and fixed to the eaves gutter 10, and the second cylindrical portion 30 of the second member 3A is surrounded by the fourth cylindrical portion 40 of the third member 4. In addition, the peripheral portion 10c of the inlet 10b of the eaves gutter 10 and the third member 4 are fixed by being sandwiched between the first flange 21 of the first member 2 and the stepped portion 33A of the second member 3A. As a result, the connection portion (fitting portion) between the first member 2 and the second member 3A is covered by the third member 4. Therefore, watertightness can be ensured for the entire drain 1A, and for example, rainwater flowing into the inlet 10b can be prevented from flowing out from the locking hole 32 of the second member 3 at the connection portion between the first member 2 and the second member 3A. Furthermore, with the installation of the third member 4, the fitting portion between the first member 2 and the second member 3A is located inside the third member 4, making it less noticeable when viewed as a whole drain 1A. This is expected to improve the overall aesthetic appearance of the Drain 1A.

[0074] In one modified example, the first cylindrical portion 20, the locking piece 22, and the handle 23 may be formed by injection molding of a resin such as rigid polyvinyl chloride resin, polycarbonate, or ABS, or they may be made of a metal such as cast iron. The first cylindrical portion 20, the locking piece 22, and the handle 23 may be formed as a single continuous piece, or they may be formed as separate parts.

[0075] In one modified example, the shape of the handle 23 is not particularly limited. The handle 23 is not essential.

[0076] In one modified example, at least one of the materials of the second member 3 and the third member 4 does not necessarily have to be rigid polyvinyl chloride. The materials of the second member 3 and the third member 4 may be determined according to the requirements of the piping system, and may be synthetic resins such as polyethylene, or metal instead of synthetic resin.

[0077] In one modified example, the second cylindrical portion 30, the third cylindrical portion 31, and the stepped portion 33 may be formed as a single continuous and integrated part, or they may be formed as separate parts.

[0078] [3. Appearance] As will be apparent from the above embodiments and modifications, this disclosure includes the following aspects.

[0079] The first embodiment is a drain comprising: a first cylindrical portion disposed at the inlet of a gutter; a first flange extending outward from the upstream end of the first cylindrical portion and disposed at the periphery of the inlet in the gutter; and a first member having one or more locking pieces projecting from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion; a second cylindrical portion defining the upstream end into which the downstream end of the first cylindrical portion is inserted; and a second member having one or more locking holes located in the second cylindrical portion such that one or more locking pieces fit when the first cylindrical portion is inserted to a defined position relative to the second cylindrical portion, wherein the inner diameter of the inlet is 30 mm or more and 70 mm or less, and if the inner diameter of the first cylindrical portion is Du and the inner diameter of the second cylindrical portion is D, then the condition 0.90D ≤ Du ≤ 0.95D is satisfied.

[0080] The second embodiment is a drain based on the first embodiment. The second member has a third cylindrical portion that defines a downstream end that can be connected to a piping member.

[0081] A third embodiment is a drain based on the first or second embodiment. It further comprises a cylindrical third member surrounding the second cylindrical portion, the second member having a peripheral edge and a stepped portion sandwiching the third member between itself and the first flange.

[0082] The fourth aspect is a drain based on the third aspect. The stepped portion is in contact with the third member around its entire circumference.

[0083] A fifth embodiment is a drain based on the third or fourth embodiment. The third member has a fourth cylindrical portion surrounding a second cylindrical portion, and a second flange extending outward from the upstream end of the fourth cylindrical portion and sandwiching its peripheral edge between itself and the first flange.

[0084] The sixth aspect is a drain based on any one of the first to fifth aspects. One or more locking pieces include two locking pieces aligned radially to the first cylindrical portion when viewed from the direction of the central axis of the first cylindrical portion, and one or more locking holes include two locking holes aligned radially to the second cylindrical portion when viewed from the direction of the central axis of the second cylindrical portion.

[0085] The seventh aspect is a drain based on any one of the first to sixth aspects. One or more locking pieces have a spring portion projecting from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion, and a claw portion projecting radially outward from the spring portion of the first cylindrical portion, the height of which is 1 mm or less.

[0086] The eighth aspect is a drain based on any one of the first to seventh aspects. In the circumferential direction of the second cylindrical portion, one or more locking holes are longer than one or more locking pieces, and the central angle of the one or more locking holes as viewed from the direction of the central axis of the second cylindrical portion is 10° or more and 90° or less.

[0087] The ninth aspect is a drain based on any one of the first to eighth aspects. The corners on the first cylindrical portion side of both ends of one or more locking holes in the circumferential direction of the second cylindrical portion are tapered by 1 degree or more.

[0088] The tenth embodiment is a drain based on any one of the first to ninth embodiments. The inner circumferential surface of the first cylindrical portion and the surface of the first flange opposite to the first cylindrical portion are connected by a curved surface having a radius of curvature of 1 mm or more in the cross-section passing through the central axis of the first cylindrical portion. [Industrial applicability]

[0089] This disclosure is applicable to drains. [Explanation of Symbols]

[0090] 1.1A Drain 2. First Member 20 First cylinder part 20a, 3a, 4a Upstream end 20b, 3b, 4b Downstream end 20d Inner surface C2,C20,C30 center axis 21 First Flange 22 Locking piece 221 Spring section 222 Claw part 23 Handle 3,3A Second member 30 Second cylinder part 31 Third cylinder part 32 locking holes 32a corner 33,33A Stepped section 34 Convex part 4. Third Member 40 4th cylinder part 41. Second flange 10 Gutters 10a bottom wall 10b Inlet 10c Peripheral area 11. Vertical pipe (piping component) 12. Horizontal pipe (piping component)

Claims

1. A first member having a first cylindrical portion positioned at the inlet of the gutter, a first flange extending outward from the upstream end of the first cylindrical portion and positioned at the periphery of the inlet in the gutter, and one or more locking pieces projecting from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion, A second cylindrical portion that defines the upstream end into which the downstream end of the first cylindrical portion is inserted, and a second member having one or more locking holes located in the second cylindrical portion such that when the first cylindrical portion is inserted to a defined position relative to the second cylindrical portion, one or more locking pieces are fitted into it. Equipped with, The inner diameter of the inlet is 30 mm or more and 70 mm or less. The inner diameter of the first cylindrical portion is Du, If the inner diameter of the second cylindrical portion is D, Satisfying 0.90D ≤ Du ≤ 0.95D, Drain.

2. The second member has a third cylindrical portion that defines a downstream end that can be connected to the piping member. The drain according to claim 1.

3. The invention further comprises a cylindrical third member surrounding the second cylindrical portion, The second member has a stepped portion that sandwiches the peripheral edge and the third member between itself and the first flange. The drain according to claim 1.

4. The stepped portion is in contact with the third member over the entire circumference of the third member. The drain according to claim 3.

5. The third member is, The fourth cylindrical portion surrounds the second cylindrical portion, A second flange extending outward from the upstream end of the fourth cylindrical portion and sandwiching the peripheral portion between itself and the first flange, Having, The drain according to claim 3.

6. The one or more locking pieces include two locking pieces that are aligned radially to the first cylindrical portion when viewed from the direction of the central axis of the first cylindrical portion, The one or more locking holes include two locking holes that are aligned radially to the second cylindrical portion when viewed from the direction of the central axis of the second cylindrical portion. The drain according to claim 1.

7. The one or more locking pieces mentioned above are, A spring portion protruding from the downstream end of the first cylindrical portion in the direction of the central axis of the first cylindrical portion, A claw portion that protrudes radially outward from the spring portion to the first cylindrical portion, It has, The height of the claw portion is 1 mm or less. The drain according to claim 1.

8. In the circumferential direction of the second cylindrical portion, the one or more locking holes are longer than the one or more locking pieces. The central angle of the one or more locking holes, as viewed from the direction of the central axis of the second cylindrical portion, is 10° or more and 90° or less. The drain according to claim 1.

9. The corners on the first cylindrical portion side of both ends of the one or more locking holes in the circumferential direction of the second cylindrical portion are tapered by 1 degree or more. The drain according to claim 1.

10. The inner circumferential surface of the first cylindrical portion and the surface of the first flange opposite to the first cylindrical portion are connected by a curved surface having a radius of curvature of 1 mm or more in a cross-section passing through the central axis of the first cylindrical portion. The drain according to claim 1.

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